blob: a85ad5f7ed4aabc5a386e423fb2146bcaa845480 [file] [log] [blame]
#define _GNU_SOURCE
#include <gtk/gtk.h>
#include <stdlib.h>
#include <stdio.h>
#include <gdk/gdkkeysyms.h>
#include <math.h>
typedef struct _point {
gdouble x, y;
} point_t;
typedef struct _box {
point_t p1, p2;
} box_t;
typedef struct _line {
point_t p1, p2;
} line_t;
typedef struct _trapezoid {
gdouble top, bottom;
line_t left, right;
} trapezoid_t;
typedef struct _traps {
struct _traps *next, *prev;
box_t extents;
int num_traps;
int size;
trapezoid_t traps[0];
} traps_t;
typedef struct _edge {
line_t line;
gdouble top, bottom;
point_t p1, p2;
int dir;
} edge_t;
typedef struct _edges {
struct _edges *next, *prev;
box_t extents;
int num_edges;
int size;
edge_t edges[0];
} edges_t;
typedef struct _TrapView {
GtkWidget widget;
struct _TrapView *group_head;
struct _TrapView *group_next;
struct _TrapView *group_prev;
traps_t *traps_list;
traps_t *current_traps;
edges_t *edges_list;
edges_t *current_edges;
double px, py;
gint mag_x, mag_y;
gint mag_size;
gdouble mag_zoom;
gboolean in_mag_drag;
gint mag_drag_x, mag_drag_y;
} TrapView;
typedef struct _TrapViewClass {
GtkWidgetClass parent_class;
} TrapViewClass;
G_DEFINE_TYPE (TrapView, trap_view, GTK_TYPE_WIDGET)
static gdouble
_compute_intersection_x_for_y (const line_t *line,
gdouble y)
{
gdouble dx = line->p2.x - line->p1.x;
gdouble dy = line->p2.y - line->p1.y;
gdouble x;
if (y == line->p1.y)
return line->p1.x;
if (y == line->p2.y)
return line->p2.x;
x = line->p1.x;
if (dy != 0)
x += (y - line->p1.y)*dx/dy;
return x;
}
static void
_compute_intersection_point (const line_t *line,
gdouble y,
point_t *p)
{
p->x = _compute_intersection_x_for_y (line, p->y = y);
}
static void
trap_view_draw (TrapView *self, cairo_t *cr)
{
traps_t *traps;
edges_t *edges;
gdouble sf_x, sf_y, sf;
gdouble mid, dim;
gdouble x0, x1, y0, y1;
double dash[2] = {8, 8};
double dots[2] = {0., 1.};
int n;
box_t extents;
point_t p;
cairo_save (cr);
cairo_save (cr);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_restore (cr);
traps = self->current_traps;
edges = self->current_edges;
if (traps == NULL && edges == NULL)
return;
if (traps != NULL) {
extents = traps->extents;
if (edges != NULL) {
if (edges->extents.p1.x < extents.p1.x)
extents.p1.x = edges->extents.p1.x;
if (edges->extents.p1.y < extents.p1.y)
extents.p1.y = edges->extents.p1.y;
if (edges->extents.p2.x > extents.p2.x)
extents.p2.x = edges->extents.p2.x;
if (edges->extents.p2.y > extents.p2.y)
extents.p2.y = edges->extents.p2.y;
}
} else
extents = edges->extents;
mid = (extents.p2.x + extents.p1.x) / 2.;
dim = (extents.p2.x - extents.p1.x) / 2. * 1.25;
sf_x = self->widget.allocation.width / dim / 2;
mid = (extents.p2.y + extents.p1.y) / 2.;
dim = (extents.p2.y - extents.p1.y) / 2. * 1.25;
sf_y = self->widget.allocation.height / dim / 2;
sf = MIN (sf_x, sf_y);
mid = (extents.p2.x + extents.p1.x) / 2.;
dim = sf_x / sf * (extents.p2.x - extents.p1.x) / 2. * 1.25;
x0 = mid - dim;
x1 = mid + dim;
mid = (extents.p2.y + extents.p1.y) / 2.;
dim = sf_y / sf * (extents.p2.y - extents.p1.y) / 2. * 1.25;
y0 = mid - dim;
y1 = mid + dim;
if (traps != NULL) {
cairo_save (cr);
cairo_scale (cr, sf, sf);
cairo_translate (cr, -x0, -y0);
cairo_set_source_rgba (cr, 0, 1, 0, .2);
for (n = 0; n < traps->num_traps; n++) {
const trapezoid_t *t = &traps->traps[n];
_compute_intersection_point (&t->left, t->top, &p);
cairo_move_to (cr, p.x, p.y);
_compute_intersection_point (&t->right, t->top, &p);
cairo_line_to (cr, p.x, p.y);
_compute_intersection_point (&t->right, t->bottom, &p);
cairo_line_to (cr, p.x, p.y);
_compute_intersection_point (&t->left, t->bottom, &p);
cairo_line_to (cr, p.x, p.y);
cairo_close_path (cr);
cairo_fill (cr);
}
cairo_restore (cr);
}
if (edges == NULL) {
cairo_save (cr);
/* top, bottom */
cairo_save (cr); {
cairo_matrix_t m;
cairo_matrix_init_scale (&m, sf, sf);
cairo_matrix_translate (&m, -x0, -y0);
cairo_set_line_width (cr, 1.);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
for (n = 0; n < traps->num_traps; n++) {
const trapezoid_t *t = &traps->traps[n];
_compute_intersection_point (&t->left, t->top, &p);
cairo_matrix_transform_point (&m, &p.x, &p.y);
cairo_move_to (cr, floor (p.x), floor (p.y) + .5);
cairo_set_dash (cr, dash, 2, fmod (floor (p.x), dash[0] + dash[1]));
_compute_intersection_point (&t->right, t->top, &p);
cairo_matrix_transform_point (&m, &p.x, &p.y);
cairo_line_to (cr, ceil (p.x), floor (p.y) + .5);
cairo_stroke (cr);
_compute_intersection_point (&t->left, t->bottom, &p);
cairo_matrix_transform_point (&m, &p.x, &p.y);
cairo_move_to (cr, floor (p.x), floor (p.y) + .5);
cairo_set_dash (cr, dash, 2, fmod (floor (p.x), dash[0] + dash[1]));
_compute_intersection_point (&t->right, t->bottom, &p);
cairo_matrix_transform_point (&m, &p.x, &p.y);
cairo_line_to (cr, ceil (p.x), floor (p.y) + .5);
cairo_stroke (cr);
}
} cairo_restore (cr);
/* left extents */
cairo_save (cr); {
cairo_save (cr); {
cairo_scale (cr, sf, sf);
cairo_translate (cr, -x0, -y0);
for (n = 0; n < traps->num_traps; n++) {
const trapezoid_t *t = &traps->traps[n];
cairo_move_to (cr, t->left.p1.x, t->left.p1.y);
cairo_line_to (cr, t->left.p2.x, t->left.p2.y);
}
} cairo_restore (cr);
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_set_line_width (cr, 1.);
cairo_set_dash (cr, dash, 2, 0.);
cairo_stroke (cr);
} cairo_restore (cr);
/* left line */
cairo_save (cr); {
cairo_save (cr); {
cairo_scale (cr, sf, sf);
cairo_translate (cr, -x0, -y0);
for (n = 0; n < traps->num_traps; n++) {
const trapezoid_t *t = &traps->traps[n];
_compute_intersection_point (&t->left, t->top, &p);
cairo_move_to (cr, p.x, p.y);
_compute_intersection_point (&t->left, t->bottom, &p);
cairo_line_to (cr, p.x, p.y);
}
} cairo_restore (cr);
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_stroke (cr);
} cairo_restore (cr);
/* right extents */
cairo_save (cr); {
cairo_save (cr); {
cairo_scale (cr, sf, sf);
cairo_translate (cr, -x0, -y0);
for (n = 0; n < traps->num_traps; n++) {
const trapezoid_t *t = &traps->traps[n];
cairo_move_to (cr, t->right.p1.x, t->right.p1.y);
cairo_line_to (cr, t->right.p2.x, t->right.p2.y);
}
} cairo_restore (cr);
cairo_set_source_rgb (cr, 0, 0, 1);
cairo_set_line_width (cr, 1.);
cairo_set_dash (cr, dash, 2, 0.);
cairo_stroke (cr);
} cairo_restore (cr);
/* right line */
cairo_save (cr); {
cairo_save (cr); {
cairo_scale (cr, sf, sf);
cairo_translate (cr, -x0, -y0);
for (n = 0; n < traps->num_traps; n++) {
const trapezoid_t *t = &traps->traps[n];
_compute_intersection_point (&t->right, t->top, &p);
cairo_move_to (cr, p.x, p.y);
_compute_intersection_point (&t->right, t->bottom, &p);
cairo_line_to (cr, p.x, p.y);
} cairo_restore (cr);
cairo_set_source_rgb (cr, 0, 0, 1);
cairo_stroke (cr);
} cairo_restore (cr);
}
/* end-points */
cairo_save (cr); {
cairo_save (cr); {
cairo_scale (cr, sf, sf);
cairo_translate (cr, -x0, -y0);
for (n = 0; n < traps->num_traps; n++) {
const trapezoid_t *t = &traps->traps[n];
_compute_intersection_point (&t->left, t->top, &p);
cairo_move_to (cr, p.x, p.y);
cairo_close_path (cr);
_compute_intersection_point (&t->left, t->bottom, &p);
cairo_move_to (cr, p.x, p.y);
cairo_close_path (cr);
_compute_intersection_point (&t->right, t->top, &p);
cairo_move_to (cr, p.x, p.y);
cairo_close_path (cr);
_compute_intersection_point (&t->right, t->bottom, &p);
cairo_move_to (cr, p.x, p.y);
cairo_close_path (cr);
}
} cairo_restore (cr);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_dash (cr, dots, 2, 0.);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
cairo_set_line_width (cr, 4.);
cairo_stroke (cr);
} cairo_restore (cr);
cairo_restore (cr);
} else {
cairo_save (cr);
for (n = 0; n < edges->num_edges; n++) {
const edge_t *e = &edges->edges[n];
cairo_save (cr); {
cairo_scale (cr, sf, sf);
cairo_translate (cr, -x0, -y0);
cairo_move_to (cr, e->p1.x, e->p1.y);
cairo_line_to (cr, e->p2.x, e->p2.y);
} cairo_restore (cr);
if (e->dir < 0) {
cairo_set_source_rgb (cr, 0, 0, 1);
cairo_set_dash (cr, dash, 2, dash[0]);
} else {
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_set_dash (cr, dash, 2, 0.);
}
cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
cairo_set_line_width (cr, 1.);
cairo_stroke (cr);
cairo_save (cr); {
cairo_scale (cr, sf, sf);
cairo_translate (cr, -x0, -y0);
cairo_move_to (cr, e->p1.x, e->p1.y);
cairo_close_path (cr);
cairo_move_to (cr, e->p2.x, e->p2.y);
cairo_close_path (cr);
} cairo_restore (cr);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_dash (cr, dots, 2, 0.);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
cairo_set_line_width (cr, 4.);
cairo_stroke (cr);
}
cairo_restore (cr);
}
/* draw a zoom view of the area around the mouse */
{
cairo_save (cr);
double zoom = self->mag_zoom;
int size = self->mag_size;
/* bottom right */
cairo_rectangle (cr, self->mag_x, self->mag_y, size, size);
cairo_stroke_preserve (cr);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_fill_preserve (cr);
cairo_clip (cr);
/* compute roi in extents */
cairo_translate (cr, self->mag_x + size/2, self->mag_y + size/2);
if (traps != NULL) {
cairo_save (cr);
cairo_scale (cr, zoom, zoom);
cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
for (n = 0; n < traps->num_traps; n++) {
const trapezoid_t *t = &traps->traps[n];
_compute_intersection_point (&t->left, t->top, &p);
cairo_move_to (cr, p.x, p.y);
_compute_intersection_point (&t->right, t->top, &p);
cairo_line_to (cr, p.x, p.y);
_compute_intersection_point (&t->right, t->bottom, &p);
cairo_line_to (cr, p.x, p.y);
_compute_intersection_point (&t->left, t->bottom, &p);
cairo_line_to (cr, p.x, p.y);
cairo_close_path (cr);
cairo_set_source_rgba (cr, 0, 1, 0, .2);
cairo_fill (cr);
}
cairo_restore (cr);
}
if (edges == NULL) {
cairo_save (cr); {
cairo_matrix_t m;
cairo_matrix_init_scale (&m, zoom, zoom);
cairo_matrix_translate (&m, -(self->px / sf + x0), -(self->py /sf + y0));
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_line_width (cr, 1.);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
for (n = 0; n < traps->num_traps; n++) {
const trapezoid_t *t = &traps->traps[n];
_compute_intersection_point (&t->left, t->top, &p);
cairo_matrix_transform_point (&m, &p.x, &p.y);
cairo_move_to (cr, floor (p.x), floor (p.y) + .5);
cairo_set_dash (cr, dash, 2, fmod (floor (p.x), dash[0] + dash[1]));
_compute_intersection_point (&t->right, t->top, &p);
cairo_matrix_transform_point (&m, &p.x, &p.y);
cairo_line_to (cr, ceil (p.x), floor (p.y) + .5);
cairo_stroke (cr);
_compute_intersection_point (&t->left, t->bottom, &p);
cairo_matrix_transform_point (&m, &p.x, &p.y);
cairo_move_to (cr, floor (p.x), floor (p.y) + .5);
cairo_set_dash (cr, dash, 2, fmod (floor (p.x), dash[0] + dash[1]));
_compute_intersection_point (&t->right, t->bottom, &p);
cairo_matrix_transform_point (&m, &p.x, &p.y);
cairo_line_to (cr, ceil (p.x), floor (p.y) + .5);
cairo_stroke (cr);
}
} cairo_restore (cr);
cairo_save (cr); { /* left extents */
cairo_save (cr); {
cairo_scale (cr, zoom, zoom);
cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
for (n = 0; n < traps->num_traps; n++) {
const trapezoid_t *t = &traps->traps[n];
cairo_move_to (cr, t->left.p1.x, t->left.p1.y);
cairo_line_to (cr, t->left.p2.x, t->left.p2.y);
}
} cairo_restore (cr);
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_set_line_width (cr, .5);
cairo_set_dash (cr, dash, 2, 0.);
cairo_stroke (cr);
} cairo_restore (cr);
cairo_save (cr); { /* right extents */
cairo_save (cr); {
cairo_scale (cr, zoom, zoom);
cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
for (n = 0; n < traps->num_traps; n++) {
const trapezoid_t *t = &traps->traps[n];
cairo_move_to (cr, t->right.p1.x, t->right.p1.y);
cairo_line_to (cr, t->right.p2.x, t->right.p2.y);
}
} cairo_restore (cr);
cairo_set_source_rgb (cr, 0, 0, 1);
cairo_set_line_width (cr, .5);
cairo_set_dash (cr, dash, 2, 0.);
cairo_stroke (cr);
} cairo_restore (cr);
cairo_save (cr); { /* left lines */
cairo_save (cr);
cairo_scale (cr, zoom, zoom);
cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
for (n = 0; n < traps->num_traps; n++) {
const trapezoid_t *t = &traps->traps[n];
_compute_intersection_point (&t->left, t->top, &p);
cairo_move_to (cr, p.x, p.y);
_compute_intersection_point (&t->left, t->bottom, &p);
cairo_line_to (cr, p.x, p.y);
}
cairo_restore (cr);
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_stroke (cr);
} cairo_restore (cr);
cairo_save (cr); { /* right lines */
cairo_save (cr);
cairo_scale (cr, zoom, zoom);
cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
for (n = 0; n < traps->num_traps; n++) {
const trapezoid_t *t = &traps->traps[n];
_compute_intersection_point (&t->right, t->top, &p);
cairo_move_to (cr, p.x, p.y);
_compute_intersection_point (&t->right, t->bottom, &p);
cairo_line_to (cr, p.x, p.y);
}
cairo_restore (cr);
cairo_set_source_rgb (cr, 0, 0, 1);
cairo_stroke (cr);
} cairo_restore (cr);
/* end-points */
cairo_save (cr); {
double dots[2] = {0., 1.};
cairo_save (cr);
cairo_scale (cr, zoom, zoom);
cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
for (n = 0; n < traps->num_traps; n++) {
const trapezoid_t *t = &traps->traps[n];
_compute_intersection_point (&t->left, t->top, &p);
cairo_move_to (cr, p.x, p.y);
cairo_close_path (cr);
_compute_intersection_point (&t->left, t->bottom, &p);
cairo_move_to (cr, p.x, p.y);
cairo_close_path (cr);
_compute_intersection_point (&t->right, t->top, &p);
cairo_move_to (cr, p.x, p.y);
cairo_close_path (cr);
_compute_intersection_point (&t->right, t->bottom, &p);
cairo_move_to (cr, p.x, p.y);
cairo_close_path (cr);
}
cairo_restore (cr);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_dash (cr, dots, 2, 0.);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
cairo_set_line_width (cr, 4.);
cairo_stroke (cr);
} cairo_restore (cr);
} else {
cairo_save (cr);
for (n = 0; n < edges->num_edges; n++) {
const edge_t *e = &edges->edges[n];
cairo_save (cr); {
cairo_scale (cr, zoom, zoom);
cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
cairo_move_to (cr, e->p1.x, e->p1.y);
cairo_line_to (cr, e->p2.x, e->p2.y);
} cairo_restore (cr);
if (e->dir < 0) {
cairo_set_source_rgb (cr, 0, 0, 1);
cairo_set_dash (cr, dash, 2, dash[0]);
} else {
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_set_dash (cr, dash, 2, 0.);
}
cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
cairo_set_line_width (cr, 1.);
cairo_stroke (cr);
cairo_save (cr); {
cairo_scale (cr, zoom, zoom);
cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
cairo_move_to (cr, e->p1.x, e->p1.y);
cairo_close_path (cr);
cairo_move_to (cr, e->p2.x, e->p2.y);
cairo_close_path (cr);
} cairo_restore (cr);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_dash (cr, dots, 2, 0.);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
cairo_set_line_width (cr, 4.);
cairo_stroke (cr);
}
cairo_restore (cr);
}
/* grid */
cairo_save (cr); {
int i;
cairo_translate (cr,
-zoom*fmod (self->px/sf + x0, 1.),
-zoom*fmod (self->py/sf + y0, 1.));
for (i = -size/2/zoom - 1; i <= size/2/zoom + 1; i++) {
cairo_move_to (cr, zoom*i, -size/2);
cairo_line_to (cr, zoom*i, size/2 + zoom);
cairo_move_to (cr, -size/2, zoom*i);
cairo_line_to (cr, size/2 + zoom, zoom*i);
}
cairo_set_source_rgba (cr, .7, .7, .7, .5);
cairo_set_line_width (cr, 1.);
cairo_stroke (cr);
} cairo_restore (cr);
}
cairo_restore (cr);
}
static gdouble
edge_length (const edge_t *e)
{
return hypot (e->p2.x - e->p1.x, e->p2.y - e->p1.y);
}
static gdouble
edges_compute_total_length (const edges_t *edges)
{
int n;
gdouble len = 0.;
for (n = 0; n < edges->num_edges; n++)
len += edge_length (&edges->edges[n]);
return len;
}
static gdouble
trapezoid_area (const trapezoid_t *t)
{
gdouble inner_left, inner_right;
gdouble outer_left, outer_right;
gdouble height;
gdouble area;
/* split into 3 sections: a rectangle with a pair of triangular bookends */
inner_left = _compute_intersection_x_for_y (&t->left, t->top);
outer_left = _compute_intersection_x_for_y (&t->left, t->bottom);
if (outer_left > inner_left) {
gdouble t = outer_left;
outer_left = inner_left;
inner_left = t;
}
inner_right = _compute_intersection_x_for_y (&t->right, t->top);
outer_right = _compute_intersection_x_for_y (&t->right, t->bottom);
if (outer_right > inner_right) {
gdouble t = outer_right;
outer_right = inner_right;
inner_right = t;
}
if (outer_left > outer_right) { /* reverse */
gdouble t;
t = outer_left;
outer_left = inner_right;
inner_right = t;
t = inner_left;
inner_left = outer_right;
outer_right = t;
}
height = t->bottom - t->top;
area = (inner_left - outer_left) * height / 2;
area += (outer_right - inner_right) * height / 2;
area += (inner_right - inner_left) * height;
return area;
}
static gdouble
traps_compute_total_area (const traps_t *traps)
{
int n;
gdouble area = 0.;
for (n = 0; n < traps->num_traps; n++)
area += trapezoid_area (&traps->traps[n]);
return area;
}
static void
trap_view_draw_labels (TrapView *self, cairo_t *cr)
{
PangoLayout *layout;
gint width, height;
GString *string;
gchar *str;
traps_t *traps;
edges_t *edges;
string = g_string_new (NULL);
traps = self->current_traps;
if (traps != NULL) {
/* convert total area from fixed-point (assuming 24.8) */
gdouble total_area = traps_compute_total_area (traps) / (256. * 256.);
g_string_append_printf (string,
"Number of trapezoids:\t%d\n"
"Total area of trapezoids:\t%.2f\n",
traps->num_traps,
total_area);
}
edges = self->current_edges;
if (edges != NULL) {
double total_length = edges_compute_total_length (edges) / 256.;
g_string_append_printf (string,
"Number of edges:\t%d\n"
"Total length of edges: \t%.2f\n",
edges->num_edges,
total_length);
}
str = g_string_free (string, FALSE);
layout = gtk_widget_create_pango_layout (&self->widget, str);
g_free (str);
pango_layout_get_pixel_size (layout, &width, &height);
cairo_move_to (cr, 10, 40);
pango_cairo_show_layout (cr, layout);
g_object_unref (layout);
}
static gboolean
trap_view_expose (GtkWidget *w, GdkEventExpose *ev)
{
TrapView *self = (TrapView *) w;
cairo_t *cr;
cr = gdk_cairo_create (w->window);
gdk_cairo_region (cr, ev->region);
cairo_clip (cr);
trap_view_draw (self, cr);
trap_view_draw_labels (self, cr);
cairo_destroy (cr);
return FALSE;
}
static void
trap_view_advance (TrapView *self)
{
if (self->current_traps && self->current_traps->prev)
self->current_traps = self->current_traps->prev;
if (self->current_edges && self->current_edges->prev)
self->current_edges = self->current_edges->prev;
gtk_widget_queue_draw (&self->widget);
}
static void
trap_view_back (TrapView *self)
{
if (self->current_traps && self->current_traps->next)
self->current_traps = self->current_traps->next;
if (self->current_edges && self->current_edges->next)
self->current_edges = self->current_edges->next;
gtk_widget_queue_draw (&self->widget);
}
static void
trap_view_group_foreach (TrapView *group, GFunc func, gpointer data)
{
while (group) {
func (group, data);
group = group->group_next;
}
}
static gboolean
trap_view_key_press (GtkWidget *w, GdkEventKey *ev)
{
TrapView *self = (TrapView *) w;
switch (ev->keyval) {
case GDK_BackSpace:
trap_view_group_foreach (self->group_head,
(GFunc) trap_view_back,
NULL);
break;
case GDK_space:
trap_view_group_foreach (self->group_head,
(GFunc) trap_view_advance,
NULL);
break;
case GDK_Return:
trap_view_group_foreach (self->group_head,
(GFunc) trap_view_advance,
NULL);
break;
case GDK_Escape:
case GDK_Q:
gtk_main_quit ();
break;
}
return FALSE;
}
static gboolean
trap_view_button_press (GtkWidget *w, GdkEventButton *ev)
{
TrapView *self = (TrapView *) w;
if (ev->x < self->mag_x ||
ev->y < self->mag_y ||
ev->x > self->mag_x + self->mag_size ||
ev->y > self->mag_y + self->mag_size)
{
if (ev->type == GDK_BUTTON_PRESS) {
if (self->current_traps == NULL)
return FALSE;
if (ev->button == 1) {
trap_view_group_foreach (self->group_head,
(GFunc) trap_view_advance,
NULL);
} else if (ev->button == 3) {
trap_view_group_foreach (self->group_head,
(GFunc) trap_view_back,
NULL);
}
}
}
else
{
self->in_mag_drag = TRUE;
self->mag_drag_x = ev->x;
self->mag_drag_y = ev->y;
}
return FALSE;
}
static gboolean
trap_view_button_release (GtkWidget *w, GdkEventButton *ev)
{
TrapView *self = (TrapView *) w;
self->in_mag_drag = FALSE;
return FALSE;
}
static void
trap_view_update_mouse (TrapView *self, GdkEventMotion *ev)
{
self->px = ev->x;
self->py = ev->y;
gtk_widget_queue_draw (&self->widget);
}
static void
trap_view_update_magnifier (TrapView *self, gint *xy)
{
self->mag_x = xy[0];
self->mag_y = xy[1];
gtk_widget_queue_draw (&self->widget);
}
static gboolean
trap_view_motion (GtkWidget *w, GdkEventMotion *ev)
{
TrapView *self = (TrapView *) w;
if (self->in_mag_drag) {
int xy[2];
xy[0] = self->mag_x + ev->x - self->mag_drag_x;
xy[1] = self->mag_y + ev->y - self->mag_drag_y;
trap_view_group_foreach (self->group_head,
(GFunc) trap_view_update_magnifier,
xy);
self->mag_drag_x = ev->x;
self->mag_drag_y = ev->y;
} else if (ev->x < self->mag_x ||
ev->y < self->mag_y ||
ev->x > self->mag_x + self->mag_size ||
ev->y > self->mag_y + self->mag_size)
{
trap_view_group_foreach (self->group_head,
(GFunc) trap_view_update_mouse,
ev);
}
return FALSE;
}
static void
trap_view_realize (GtkWidget *widget)
{
GdkWindowAttr attributes;
GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = widget->allocation.x;
attributes.y = widget->allocation.y;
attributes.width = widget->allocation.width;
attributes.height = widget->allocation.height;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
attributes.colormap = gtk_widget_get_colormap (widget);
attributes.event_mask = gtk_widget_get_events (widget) |
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_KEY_PRESS_MASK |
GDK_KEY_RELEASE_MASK |
GDK_POINTER_MOTION_MASK |
GDK_BUTTON_MOTION_MASK |
GDK_EXPOSURE_MASK;
widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
&attributes,
GDK_WA_X | GDK_WA_Y |
GDK_WA_VISUAL | GDK_WA_COLORMAP);
gdk_window_set_user_data (widget->window, widget);
widget->style = gtk_style_attach (widget->style, widget->window);
gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
}
static void
trap_view_size_allocate (GtkWidget *w, GdkRectangle *r)
{
TrapView *self = (TrapView *) w;
GTK_WIDGET_CLASS (trap_view_parent_class)->size_allocate (w, r);
self->mag_x = w->allocation.width - self->mag_size - 10;
self->mag_y = w->allocation.height - self->mag_size - 10;
}
static void
trap_view_finalize (GObject *obj)
{
G_OBJECT_CLASS (trap_view_parent_class)->finalize (obj);
}
static void
trap_view_class_init (TrapViewClass *klass)
{
GObjectClass *object_class = (GObjectClass *) klass;
GtkWidgetClass *widget_class = (GtkWidgetClass *) klass;
object_class->finalize = trap_view_finalize;
widget_class->realize = trap_view_realize;
widget_class->size_allocate = trap_view_size_allocate;
widget_class->expose_event = trap_view_expose;
widget_class->key_press_event = trap_view_key_press;
widget_class->button_press_event = trap_view_button_press;
widget_class->button_release_event = trap_view_button_release;
widget_class->motion_notify_event = trap_view_motion;
}
static void
trap_view_init (TrapView *self)
{
self->mag_zoom = 10;
self->mag_size = 200;
GTK_WIDGET_SET_FLAGS (self, GTK_CAN_FOCUS);
}
static traps_t *
_traps_add_trapezoid (TrapView *tv, traps_t *traps, const trapezoid_t *trap)
{
if (trap->top < traps->extents.p1.y)
traps->extents.p1.y = trap->top;
if (trap->bottom > traps->extents.p2.y)
traps->extents.p2.y = trap->bottom;
if (trap->left.p1.x < traps->extents.p1.x)
traps->extents.p1.x = trap->left.p1.x;
if (trap->left.p2.x < traps->extents.p1.x)
traps->extents.p1.x = trap->left.p2.x;
if (trap->right.p1.x > traps->extents.p2.x)
traps->extents.p2.x = trap->right.p1.x;
if (trap->right.p2.x > traps->extents.p2.x)
traps->extents.p2.x = trap->right.p2.x;
if (traps->num_traps == traps->size) {
int newsize = 2 * traps->size;
void *newtraps;
newtraps = g_realloc (traps,
sizeof (traps_t) + newsize * sizeof (trapezoid_t));
if (newtraps == NULL)
return traps;
if (tv->current_traps == traps)
tv->current_traps = newtraps;
traps = newtraps;
traps->size = newsize;
if (traps->next != NULL)
traps->next->prev = newtraps;
if (traps->prev != NULL)
traps->prev->next = newtraps;
else
tv->traps_list = newtraps;
}
traps->traps[traps->num_traps++] = *trap;
return traps;
}
static traps_t *
traps_new (TrapView *tv)
{
traps_t *t;
t = g_malloc (sizeof (traps_t) + 16 * sizeof (trapezoid_t));
t->prev = NULL;
t->next = tv->traps_list;
if (tv->traps_list)
tv->traps_list->prev = t;
tv->traps_list = t;
if (tv->current_traps == NULL)
tv->current_traps = t;
t->size = 16;
t->num_traps = 0;
t->extents.p1.x = G_MAXDOUBLE;
t->extents.p1.y = G_MAXDOUBLE;
t->extents.p2.x = -G_MAXDOUBLE;
t->extents.p2.y = -G_MAXDOUBLE;
return t;
}
static edges_t *
_edges_add_edge (TrapView *tv, edges_t *edges, edge_t *e)
{
if (e->top < edges->extents.p1.y)
edges->extents.p1.y = e->top;
if (e->bottom > edges->extents.p2.y)
edges->extents.p2.y = e->bottom;
_compute_intersection_point (&e->line, e->top, &e->p1);
_compute_intersection_point (&e->line, e->bottom, &e->p2);
if (e->p1.x < edges->extents.p1.x)
edges->extents.p1.x = e->p1.x;
if (e->p2.x < edges->extents.p1.x)
edges->extents.p1.x = e->p2.x;
if (e->p1.x > edges->extents.p2.x)
edges->extents.p2.x = e->p1.x;
if (e->p2.x > edges->extents.p2.x)
edges->extents.p2.x = e->p2.x;
if (edges->num_edges == edges->size) {
int newsize = 2 * edges->size;
void *newedges;
newedges = g_realloc (edges,
sizeof (edges_t) + newsize * sizeof (edge_t));
if (newedges == NULL)
return edges;
if (tv->current_edges == edges)
tv->current_edges = newedges;
edges = newedges;
edges->size = newsize;
if (edges->next != NULL)
edges->next->prev = newedges;
if (edges->prev != NULL)
edges->prev->next = newedges;
else
tv->edges_list = newedges;
}
edges->edges[edges->num_edges++] = *e;
return edges;
}
static edges_t *
edges_new (TrapView *tv)
{
edges_t *t;
t = g_malloc (sizeof (edges_t) + 16 * sizeof (edge_t));
t->prev = NULL;
t->next = tv->edges_list;
if (tv->edges_list)
tv->edges_list->prev = t;
tv->edges_list = t;
if (tv->current_edges == NULL)
tv->current_edges = t;
t->size = 16;
t->num_edges = 0;
t->extents.p1.x = G_MAXDOUBLE;
t->extents.p1.y = G_MAXDOUBLE;
t->extents.p2.x = -G_MAXDOUBLE;
t->extents.p2.y = -G_MAXDOUBLE;
return t;
}
int
main (int argc, char **argv)
{
TrapView *tv, *tv2, *group_head = NULL, *group_prev = NULL;
traps_t *traps;
edges_t *edges;
GtkWidget *window, *hbox;
FILE *file;
char *line = NULL;
size_t len = 0;
gtk_init (&argc, &argv);
hbox = gtk_hbox_new (TRUE, 0);
tv = g_object_new (trap_view_get_type (), NULL);
gtk_box_pack_start (GTK_BOX (hbox), &tv->widget, TRUE, TRUE, 0);
gtk_widget_show (&tv->widget);
tv->group_prev = group_prev;
tv->group_next = NULL;
if (group_prev)
group_prev->group_next = tv;
group_prev = tv;
if (group_head == NULL)
group_head = tv;
tv->group_head = group_head;
file = fopen (argv[1], "r");
if (file != NULL) {
edges = edges_new (tv);
while (getline (&line, &len, file) != -1) {
edge_t e;
if (sscanf (line,
"(%lf, %lf), (%lf, %lf) %lf %lf %d",
&e.line.p1.x, &e.line.p1.y,
&e.line.p2.x, &e.line.p2.y,
&e.top, &e.bottom,
&e.dir) == 7) {
edges = _edges_add_edge (tv, edges, &e);
} else {
if (edges->num_edges) {
g_print ("read %d edges\n", edges->num_edges);
g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
edges->extents.p1.x, edges->extents.p1.y,
edges->extents.p2.x, edges->extents.p2.y);
edges = edges_new (tv);
}
}
}
if (edges->num_edges) {
g_print ("read %d edges\n", edges->num_edges);
g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
edges->extents.p1.x, edges->extents.p1.y,
edges->extents.p2.x, edges->extents.p2.y);
}
fclose (file);
}
file = fopen (argv[2], "r");
if (file != NULL) {
traps = traps_new (tv);
while (getline (&line, &len, file) != -1) {
trapezoid_t t;
if (sscanf (line,
"%lf %lf L:(%lf, %lf), (%lf, %lf) R:(%lf, %lf), (%lf, %lf)",
&t.top, &t.bottom,
&t.left.p1.x, &t.left.p1.y,
&t.left.p2.x, &t.left.p2.y,
&t.right.p1.x, &t.right.p1.y,
&t.right.p2.x, &t.right.p2.y) == 10) {
traps = _traps_add_trapezoid (tv, traps, &t);
} else {
if (traps->num_traps) {
g_print ("read %d trapezoids\n", traps->num_traps);
g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
traps->extents.p1.x, traps->extents.p1.y,
traps->extents.p2.x, traps->extents.p2.y);
traps = traps_new (tv);
}
}
}
if (traps->num_traps) {
g_print ("read %d trapezoids\n", traps->num_traps);
g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
traps->extents.p1.x, traps->extents.p1.y,
traps->extents.p2.x, traps->extents.p2.y);
}
fclose (file);
}
free (line);
tv2 = g_object_new (trap_view_get_type (), NULL);
gtk_box_pack_start (GTK_BOX (hbox), &tv2->widget, TRUE, TRUE, 0);
gtk_widget_show (&tv2->widget);
tv2->traps_list = tv->traps_list;
tv2->current_traps = tv->current_traps;
tv2->group_prev = group_prev;
tv2->group_next = NULL;
group_prev->group_next = tv2;
group_prev = tv2;
tv2->group_head = group_head;
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
g_signal_connect (window, "delete-event",
G_CALLBACK (gtk_main_quit), NULL);
gtk_widget_set_size_request (window, 800, 800);
gtk_container_add (GTK_CONTAINER (window), hbox);
gtk_widget_show (hbox);
gtk_widget_show (window);
gtk_main ();
return 0;
}